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Earnings (loss) per share - Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share Reconciliation        
Net income attributable to the Company $ 32.1 $ 24.1 $ 51.1 $ 33.3
Per share data        
Basic earnings per share (usd per share) [1] $ 0.76 $ 0.57 $ 1.21 $ 0.79
Diluted earnings per share (usd per share) [1] $ 0.76 $ 0.57 $ 1.21 $ 0.79
Shares        
Weighted average number of shares of common stock outstanding - Basic 42,145 42,102 42,136 42,102
Weighted average additional shares assuming conversion of potential common shares 282 24 258 24
Shares - diluted basis 42,427 42,126 42,394 42,126
[1] On May 15, 2016, WestRock distributed 42,102 thousand shares of Ingevity's common stock to holders of its common stock. Basic and diluted earnings (loss) per share for the three and six months ended June 30, 2016 is calculated using the weighted average number of common shares outstanding for the period beginning after the Distribution Date. Basic and diluted earnings (loss) per share for the three and six months ended June 30, 2017 is calculated using the weighted average number of common shares outstanding for the period.